My main gear is Yamaha, it dates back owning Pioneer separates and I just like Japanese build quality. My turntable is a Technics 1200G, again it's Japanese. The 1200G I'm never selling it, there are stories of people with 1200Mk2's and there still in use 40 years later. One day I might buy a second 1200G and a mixer so I can mix on them! For my streaming I use a Wiim Pro with an iFi Elite PSU on it, then connect into the SACD player. If I upgrade I will be staying with Yamaha for next amp.
The higher end Yamaha gear it goes into Yamaha Music division for final tuning, the same people that make the piano's. When Yamaha tune they test against their own SACD players, so by sticking with Yamaha you know it will sound 'correct' as the engineers have done the work for you.
I don't like putting to much money into digital products as once they loose support the product is finished, that's why I like the WiiM pro, with the iFi Elite and also galvanic ethernet filtering to reduce noise, streaming from Amazon Music is 95% SACD quality, that's impressive given streaming is meant to be the worst audio medium.
I have products from Russ Andrews / Audio Quest / iFi, I have more stuff then I have ever posted about on here, I've been down the rabbit hole 3 years now and I know first hand what all the products do. I even have carbon interconnect cables from Van Den Hul. Things like cables I purchase pre-owned from eBay and can resell if I don't like them, but so far never resold anything as everything has benefited in some way.
What do you think of the Nordost Valhalla over regular copper cable? I'm bi-wiring with Kimber Kable and that was quite an improvement over regular copper, more detail and better mid range.
We are kinda similar. I don't like British amps. I like Japanese amps. The old Luxmans, Sony ES, The old marantz amps Etc. So in the early days on my hi fi journey I use to get a lot of these power cables, Russ Andrews stuff and what not. But after a while you figure out the amount of money you spend chasing these small/marginal improvements and these add up you might as well buy one and save up for the next step in audio quality.
There is nothing wrong with Yamaha although more known these days for their pianos, monitor speakers and the ilk. Over the past few years they have made a comeback into mainstream audio. They have history and have always been highly regarded in the home cinema space a few years back. I like their more reasonable price offerings rather than their flagship. The problem with their flagship while reasonably priced compared to other brands takes it into the high end category. While you do not have as many competitors than say the sub £1000 the quality it up against some formidable brands and ones with a higher hi fi pedigree than Yamaha. The Mcintosh, Luxmans and while it might be able to hold it own at that price point the real pain begins when the brands who specialise in only high end gear turn up and it gets often overlooked rightly or wrongly.
It really depends on how people define the high end so to speak. The amp is like 6k or thereabouts? To many people that would be high end. People's perception changes when the price/money comes into the equation. To some people that a silly amount to spend on an amp. Others it is a reasonable to get good quality sound and others that not even close to high end.
A lot of years ago I had so many amps, dacs, interconnects, speaker cables I ran out of space where I lived (I'm a bit of a hoarder but instead of newspapers and junk it hi fi stuff and computer parts).
As for your speaker cable question. I don't really pay attention to it by this I mean. Since I got into hih fi I have always followed the rough guideline that your speaker cables and interconnects are 10% or less of your total system cost. So it is unfair to compare a setup that costs 50k to say something that costs less than 1k. So I have the Nordost Valhalla on my main setup and I got some Chord Company I can't remember what it was that was given to me for free. I think it like £15 per M. And then some QED cable which also I don't know the name of. Which was like £2.50 per M. I don't think I have ever compared them like direct head to head. I just use them on whatever set up I am on and forget about it.
The days of me getting various cables and whatnot to check the differences and see which one I prefer are long over. I did that in my late 20's and you tend to tunnel vision it. I just enjoy my setups. People who spend fiver or less on speaker cables and interconnects then fine. People who spend more than a fiver equally fine. You enjoy it that's good enough for me. I mean for Lulz I could stick the Valhalla's on the 3030i but it just doesn't make much sense. Neither does sticking QED £2.50 per M on my main setup either.
The reason I use Nordost and I am not talking about the valhalla's in this particular case is most of the time, most of my setups have a warm tonality which I love. But matching a warm sounding amp to a set of warm sounding speakers is a no no, just like partnering a bright sounding amp to a lean speaker. So I use the Nordost just to get some synergy. I am more about system synergy than anything else. Nordost are well known to be lean sounding. Extremely forward and lean in the bass department. Which from my point of view compliments many of the warm sounding setups I have owned.
If you noticed/heard an improvement then more power to you. I am not gonna judge.